DUBAI, November 9. /TASS/. Russia’s contract for the delivery of S-300 air defense missile systems to Iran has been signed and has come into force, the head of state hi-tech corporation Rostec, which integrates Rosoboronexport state arms seller, said on Monday.

"The contract on S-300 systems has been signed," Sergey Chemezov said, without specifying the modification of antiaircraft missile systems that would be delivered to Iran.

"I believe that Iran will withdraw its claims to us, when the first part [of the contract] is completed," the Rostec CEO said.

Russia and Iran signed a contract in 2007 for the supply of five S-300PMU-1 battalions but in the autumn of 2010 then-President Dmitry Medvedev banned the supply of these systems to Tehran. The contract worth more than $800 million was annulled and the paid advance was returned to Iran.

Iran filed an almost $4 billion lawsuit against Russia at the Geneva Court of Arbitration over Russia’s nonfulfillment of the contract.

In the spring of 2015, Russian President Vladimir Putin lifted the ban on the supply of S-300 systems to Tehran.